The number to look for is the final numerical digit contained in the plate number, whether it is the final character on the plate or not, according to the governor's office.

So, for example, a theoretical plate number of "XYZ 27Q" would have "7" as its final numerical digit, and would be permitted gasoline on an odd day.

Jersey starts an odd/even system to buying gasThe feelings of motorist were mixed about buying gas today around New Jersey, after the state started rationing gas, Nov 3, 2012, going to an odd/even system. Some were caught off-guard and turned away, having to wait till tomorrow to buy gas. (Video by Saed Hindash)

Specialized or vanity plates, those not displaying any numbers, will be considered odd numbered plates.

The rules apply to out-of-state plates.

Zero is considered an even number and there is no ration for people with canisters.

And lastly, to the chargrin of those who've been in line since early this morning., the rule takes effect for all sales at noon.